BitFieldUtil.cpp

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#include "zserio/BitFieldUtil.h"
#include "zserio/CppRuntimeException.h"
 
namespace zserio
{
 
static void checkBitFieldLength(size_t length)
{
    if (length == 0 || length > 64)
    {
        throw CppRuntimeException("Asking for bound of bitfield with invalid length ") << length << "!";
    }
}
 
int64_t getBitFieldLowerBound(size_t length, bool isSigned)
{
    checkBitFieldLength(length);
 
    if (isSigned)
    {
        return -static_cast<int64_t>((UINT64_C(1) << (length - 1)) - 1) - 1;
    }
    else
    {
        return 0;
    }
}
 
uint64_t getBitFieldUpperBound(size_t length, bool isSigned)
{
    checkBitFieldLength(length);
 
    if (isSigned)
    {
        return (UINT64_C(1) << (length - 1)) - 1;
    }
    else
    {
        return length == 64 ? UINT64_MAX : ((UINT64_C(1) << length) - 1);
    }
}
 
} // namespace zserio